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Multiwall CN x nanotubes have been prepared by thermal decomposition of acetonitrile over Co/Ni catalytic particles. The fluorination of nanotubes was performed at roomtemperature by using a gaseous mixture of BrF 3 and Br 2 . Transmission electron microscopy (TEM) and x-ray diffraction (XRD) indicated that only the outer shells of CN x nanotubes were fluorinated, whereas the inner shells remained intact. Xray photoelectron spectroscopy (XPS) showed an oxidation of pyridinic-type nitrogenwith tube fluorination.

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